If the Drobo is in an unhealthy state you will encounter the same problems on the new Drobo. It is crucial the Drobo be in an all green state. First resolve the issue on the original unit, some knowledge base articles that may be helpful:
To verify you have the latest firmware, open the Drobo Dasboard, click on your Drobo, from the menu on the left hand side click on Tools, then click Check for Updates. You will either be prompted to update, or you will receive a confirmation that you are running the latest version of Drobo firmware.